US8381679B2 - Method in a milking system for creating a required vacuum level and computer program products - Google Patents

Method in a milking system for creating a required vacuum level and computer program products Download PDF

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US8381679B2
US8381679B2 US12/450,069 US45006908A US8381679B2 US 8381679 B2 US8381679 B2 US 8381679B2 US 45006908 A US45006908 A US 45006908A US 8381679 B2 US8381679 B2 US 8381679B2
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speed
variable speed
vacuum
pumps
vacuum pumps
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US20100018465A1 (en
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Henrik Idensjo
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DeLaval Holding AB
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DeLaval Holding AB
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
    • F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
    • F04B37/14—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high vacuum
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01J—MANUFACTURE OF DAIRY PRODUCTS
    • A01J5/00—Milking machines or devices
    • A01J5/04—Milking machines or devices with pneumatic manipulation of teats
    • A01J5/047—Vacuum generating means, e.g. by connecting to the air-inlet of a tractor engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/02—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for several pumps connected in series or in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/08—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the rotational speed
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/20—Control of fluid pressure characterised by the use of electric means
    • G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
    • G05D16/2066—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using controlling means acting on the pressure source
    • G05D16/2073—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using controlling means acting on the pressure source with a plurality of pressure sources
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
    • H02P5/46—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2220/00—Application
    • F04C2220/10—Vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/05—Speed
    • F04C2270/051—Controlled or regulated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/06—Acceleration
    • F04C2270/065—Controlled or regulated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/56—Number of pump/machine units in operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
    • F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/28—Safety arrangements; Monitoring

Definitions

  • the present invention relates generally to the field of vacuum regulation in connection with machine milking.
  • the invention relates to a method in a milking system for creating a required vacuum level.
  • the invention also relates to computer program products for implementing the method.
  • the vacuum regulation system of a typical dairy farm consumes a large part of the total amount of electricity used and the vacuum regulation system should thus be made as efficient as possible.
  • the vacuum regulation system typically comprises a vacuum pump, which is chosen so as to be able to remove air from within the milking system to meet a required maximum vacuum level and air demand within the milking system. If a single vacuum pump is not enough to meet the requirements, then two or more vacuum pumps may be installed. The vacuum pumps may be arranged to provide vacuum in different parts of the milking system.
  • the vacuum regulation system further typically comprises a control device to regulate the speed of the vacuum pumps, and thereby the amount of air being removed from the milking system and/or to regulate valves for keeping the vacuum level at a desired level.
  • a method for creating a required vacuum level within a milking system comprising at least two variable speed vacuum pumps.
  • the method comprises the steps: utilizing a first variable speed vacuum pump for creating the required vacuum level within the milking system; monitoring the vacuum level requirement within the milking system, and when the vacuum level requirement of the milking system is such that the speed of the first variable speed vacuum pump reaches a first speed threshold then: starting a second variable speed vacuum pump and running the first and second variable speed vacuum pumps in parallel for creating the required vacuum level.
  • to run two or more variable speed vacuum pumps in parallel means that they are all controlled based on the same control signal.
  • the control unit provides the same control signal to all vacuum pumps.
  • variable speed vacuum pumps are identical this would then in turn mean that they are run at substantially equal speed or rpm.
  • the number of variable speed vacuum pumps that is in fact needed for a particular milking operation is utilized.
  • the method comprises the additional step of decreasing the speed of the second variable speed vacuum pump to zero when the vacuum requirement within the milking system is such that the speed of the first and/or second variable speed vacuum pumps falls below a speed threshold.
  • FIG. 1 is a block diagram over an exemplary implementation of the present invention.
  • FIG. 2 is a flowchart over steps included in the method in accordance with the present invention.
  • variable speed vacuum pumps can be extended to any number of variable speed vacuum pumps.
  • variable speed vacuum pumps there have to be at least two variable speed vacuum pumps for the method to be applicable.
  • the number of variable speed vacuum pumps is primarily dependent on the size of the milking system, the vacuum level required and the amount of air that may enter (leak into) the milking system, for example during different milking operations.
  • FIG. 1 illustrates schematically different parts of a vacuum regulation system 1 suitable for creating and regulating a vacuum level within a milking system.
  • the vacuum regulation system 1 comprises three variable speed vacuum pumps P 1 , P 2 , P 3 , which can all be run at different speeds, that is, at different revolutions per minute (rpm).
  • the respective speed of the variable speed vacuum pumps P 1 , P 2 , P 3 is dependent on the vacuum requirement of and the amount of air entering the milking system.
  • the vacuum regulation system 1 further comprises vacuum lines 3 connected to the variable speed vacuum pumps P 1 , P 2 , P 3 , to a vacuum sensor 4 and to different vacuum requiring parts of the milking system. (not shown).
  • a control unit 2 is arranged to control the vacuum regulation system 1 .
  • the control unit comprises a regulator part, for example a PI-regulator.
  • the regulator provides a control signal to the variable speed vacuum pumps P 1 , P 2 , P 3 in order to regulate their speed.
  • the control unit 2 compares an input signal that indicates the actual vacuum level within the vacuum system with a desired value and the regulator regulates the speeds accordingly.
  • the control unit 2 comprises a number of inputs and a number of outputs.
  • four analog signal inputs ain 1 , ain 2 , ain 3 , ain 4 , three analog signal outputs aout 1 , aout 2 , aout 3 and six relay signal outputs r 1 , r 2 , r 3 , r 4 , r 5 , r 6 are shown. It is noted that the number of inputs and outputs may be varied in accordance with need by simply adding or removing outputs and inputs.
  • Analog signal inputs ain 1 , ain 2 and ain 3 are connected to temperature sensors 5 A, 5 B and 5 C.
  • the temperature sensors 5 A, 5 B, 5 C are optional and are arranged to measure the temperature of a respective variable speed vacuum pump P 1 , P 2 , P 3 . If the temperature of a certain variable speed vacuum pump exceeds a set threshold, the corresponding relay signal output may be used to deactivate the vacuum pump.
  • the fourth analog signal input ain 4 in the following denoted vacuum control signal ain 4 , is connected to the vacuum sensor 4 .
  • the vacuum sensor 4 is arranged to measure the vacuum level within the milking system and to provide a vacuum control signal to the control unit 2 indicating this vacuum level.
  • the vacuum control signal is input to the control unit 2 at input ain 4 .
  • the analog signal outputs aout 1 , aout 2 , aout 3 are arranged to provide a signal to each respective variable speed vacuum pump P 1 , P 2 , P 3 for regulating their respective speeds.
  • the analog signal to be sent is dependent on the analog vacuum control signal obtained from the vacuum sensor 4 .
  • the speed of the variable speed vacuum pumps P 1 , P 2 , P 3 is dependent on the vacuum requirement within the milking system (to be described more in detail later); if the vacuum sensor 4 indicates a too low level, the speed of the variable speed vacuum pumps P 1 , P 2 , P 3 has to be increased and if the speed of the variable speed vacuum pumps P 1 , P 2 , P 3 provides a vacuum level which is too high, then the speed of one or more of the variable speed vacuum pumps P 1 , P 2 , P 3 needs to be decreased.
  • the analog signal outputs aout 1 , aout 2 and aout 3 are input to each respective variable speed vacuum pump and may be a signal having a value within the range of, for example, 0-10 V, which signals are then interpreted as a specific speed command depending on its value.
  • Three of the relay signal outputs r 1 , r 2 , r 3 are arranged to provide signals to a respective one of the variable speed vacuum pumps P 1 , P 2 , P 3 for switching them on and off, respectively.
  • Relay signal output r 4 is arranged to activate a cleaning process. It is noted that such cleaning process is not applicable for all kinds of vacuum pumps, but is mainly related to lobe vacuum pumps.
  • a cleaning water valve 7 is controlled by the relay signal r 4 .
  • the cleaning of the variable speed vacuum pumps is preferably initiated automatically after a suitable number of hours of operation, although the cleaning process could alternatively be initiated manually. If several vacuum pumps are used, they should all preferably get cleaned at the same time, as all pumps should have approximately the same running hours in accordance with a multi pump switching, described later.
  • All pumps will preferably run during the washing phase in order to warm up. Thereafter water will be injected before or during the beginning of a blowing period, i.e. a period during which air is let into the vacuum system and the vacuum pumps work harder. The vacuum pumps will then dry during the end of the blowing period.
  • the time during which water will be injected can be an adjustable parameter, the parameter then being set in the control unit 2 .
  • the time during which water will be injected could for example be 0.1-0.5 litres during 10 seconds, however depending on the pump size.
  • Relay signal output r 5 is arranged to activate a valve for initiating an automatic spraying process after cleaning.
  • Such spraying process could for example comprise spraying anticorrosive or lubricant spray after a cleaning cycle has been performed.
  • a parameter could be set in the control unit 2 for setting the spray time, for example 0.1 seconds.
  • Each variable speed vacuum pump P 1 , P 2 , P 3 has a respective check valve 6 A, 6 B, 6 C connected to it.
  • the check valves 6 A, 6 B, 6 C are provided for example in order to prevent air leakages in case one of the variable speed vacuum pumps is removed, for instance due to a service, or for preventing the variable speed vacuum pumps from rotating when not engaged.
  • the control unit 2 may also comprise means for keeping track of the running time for each variable speed vacuum pump.
  • multi pump switching the change of the start order of the variable speed vacuum pumps is altered in dependence on their respective running times. For example, if the first variable speed vacuum pump P 1 has been started first for X hours (e.g. 100 hours) of power on, then the starting order can be changed so that the second variable speed vacuum pump P 2 is started first and the first variable speed vacuum pump P 1 is started last.
  • X hours e.g. 100 hours
  • the variable speed vacuum pumps are run approximately equally much.
  • the multi-pump switching principle can be extended to any number of variable speed vacuum pumps.
  • the control unit 2 may therefore comprise a relay for switching on such warning light when needed.
  • the control unit 2 may further comprise means for shutting off a variable speed vacuum pump for service, while the one or more other variable speed vacuum pump(s) is/are in operation.
  • the control unit 2 may then comprise a menu by means of which a chosen variable speed vacuum pump is put into service mode.
  • control unit 2 preferably includes a display for providing relevant information to the user, for example current vacuum level, settings, error messages, vacuum pump characteristics such as maximum speed or run time, etc.
  • the first variable speed vacuum pump P 1 is started and utilized for creating the desired vacuum level within the milking system.
  • the vacuum level within the milking system is at all times monitored by the vacuum sensor 4 .
  • first speed threshold Th 1 which for example may be 80% of its maximum speed
  • second variable speed vacuum pump P 2 is started by the relay signal provided by relay signal output r 2 .
  • the speed of the second variable speed vacuum pump P 2 is ramped up at, for example, approximately 10-20 Hz per second.
  • the speed of the second variable speed vacuum pump P 2 is ramped up and the speed of the first variable speed vacuum pump P 1 is decreased correspondingly.
  • the vacuum regulation system 1 will then work as having two parallel variable speed vacuum pumps running together.
  • the first and second variable speed vacuum pumps P 1 and P 2 are run together, which means that both variable speed vacuum pumps receive the same analog signal.
  • the signal from the vacuum sensor 4 (input at ain 4 ) is utilized for controlling both variable speed vacuum pumps.
  • variable speed vacuum pump P 3 When the speed of the variable speed vacuum pumps P 1 and P 2 reaches a certain speed limit, second speed threshold Th 2 , which again could for example be 80% of their maximum speed, then the third variable speed vacuum pump P 3 is started, and the same procedure as when starting the second variable speed vacuum pump P 2 is performed.
  • the variable speed vacuum pump P 3 is ramped up and variable speed vacuum pumps P 1 and P 2 are ramped down until all vacuum pumps have the same speed and are commonly controlled by the same control signal, provided by the control unit 2 .
  • the determination as to when the vacuum requirement is such that one variable speed vacuum pump can be shut off may for example be when the speed limit of the variable speed vacuum pumps goes below 20% of their maximum speed.
  • the third variable speed vacuum pump P 3 ramps down and stops. The speed of the first and second variable speed pumps P 1 and P 2 is then ramped up correspondingly. This procedure is repeated when the vacuum requirement is such that the first variable speed vacuum pump P 1 is enough for providing the required vacuum.
  • the criteria used for determining when to stop a vacuum pump may be a set speed limit, for example a certain percentage of its maximum speed, as described above.
  • the vacuum pump that is no longer needed may be stopped immediately or there may be a criteria such as when two vacuum pumps have run at 30% of their maximum capacity during 10 seconds, then one of them will be stopped.
  • Other criteria for determining when to stop a vacuum pump may be used, e.g. when the pump speed of each vacuum pump has decreased to 30-50%. This also applies for the decision when to start an additional vacuum pump.
  • variable speed pumps may be added in accordance with need.
  • the procedure for starting and stopping an n th variable speed vacuum pump is made in analogy with the above described procedures.
  • the speeds of the different variable speed vacuum pumps P 1 , P 2 , P 3 are assumed to be identical when they are all three required for meeting the vacuum requirement within the milking system; that is, when they are run in parallel.
  • the vacuum control signal ain 4 from the vacuum sensor 4 which control signal defines the vacuum requirement to the respective variable speed vacuum pumps P 1 , P 2 , P 3 , may be interpreted differently by the different variable speed vacuum pumps P 1 , P 2 , P 3 .
  • the vacuum control signal ain 4 may be the above-described analog input signal having a value in the range of 0-10 V.
  • variable speed vacuum pump P 1 may interpret a signal of 5 V so as to set its speed to x revolutions per minute, while variable speed vacuum pump P 2 interprets the same signal to set its speed to y revolutions per minute, where x ⁇ y.
  • their speeds need not necessarily be equal, but both variable speed vacuum pumps' speed is changed up or down depending on vacuum requirements.
  • the first speed threshold Th 1 may be set to a certain percentage of the maximum speed of the first variable speed vacuum pump, for example 80%, 90% or 95% of its maximum capacity.
  • the second speed threshold Th 2 which is the speed of the first and the second variable speed vacuum pumps when run together, may be set to a certain percentage of their maximum speed, for example 75-90%. It is noted that the thresholds may be equal or may differ. Further, it is to be noted that the speed limits above regarding when to start and shut off a variable speed vacuum pump are only exemplary. The speed limits may be altered in accordance with need, for example be within the range of 60-95%, or in the range 60-99% of their maximum speeds.
  • the speed of a variable speed vacuum pump can be translated into capacity of the variable speed vacuum pump.
  • the speed with which the variable speed vacuum pump is ramped up or ramped down may for example be within the range of 5-40 Hz per second.
  • the ramping up speed may differ from the ramping down speed; the ramping up may for example occur at steps of 20 Hz/s and the ramping down at steps of 14 Hz/s.
  • Each variable speed pump may comprise a frequency controller providing the frequency, for controlling the speed of the pump, from an input DC voltage.
  • the pump comprises a frequency controlled motor.
  • the frequency controller is suitably also adapted to provide the ramping up and down of the pump speeds.
  • the vacuum pump controller 2 provides the ramping.
  • all vacuum pumps are identical in size and type. However, different types of vacuum pumps may also be controlled in the manner described above. Examples of vacuum pumps that can be used when implementing the present invention comprise displacement vacuum pump (DVP), such as lobe vacuum pump (LVP), vane pump or scroll pump, although other vacuum pumps may be used as well.
  • DVP displacement vacuum pump
  • LVP lobe vacuum pump
  • vane pump vane pump
  • scroll pump although other vacuum pumps may be used as well.
  • FIG. 2 is a flow chart summarizing steps of the method in accordance with the invention.
  • the method 100 comprises the first step, step 110 , of utilizing a first variable speed vacuum pump P 1 for creating the required vacuum level within the milking system.
  • a second step, step 120 the vacuum level within the milking system is monitored, e.g. by means of the vacuum sensor 4 together with the control unit 2 .
  • the vacuum level of the milking system is such that the speed of the first variable speed vacuum pump P 1 reaches the first speed threshold then a third and a fourth step of the method are initiated, step 130 and step 140 .
  • step 130 the second variable speed vacuum pump P 2 is started.
  • step 140 the first and the second variable speed vacuum pumps P 1 and P 2 are run in parallel for creating the required vacuum level within the milking system.
  • the invention is also related to a computer program product that is loadable into an internal memory of a computer that is used for controlling the vacuum pumps of the vacuum regulation system.
  • the computer program product comprises software code portions for carrying out the method described above, when the computer program product is run on the computer.
  • the invention is thus easily implemented in already existing milking systems having at least two variable speed vacuum pumps.
  • the computer program product may alternatively be stored on a computer readable storage medium, for example a compact disc.
  • the computer readable storage medium comprises computer readable program code means for causing the computer of the milking station to carry out the method described above.
  • vacuum requirement is used. It is noted that a vacuum requirement (vacuum demand) within the milking system is influenced by the amount of air entering the milking system and air leaking from the milking system. The amount of air being let out/let into the milking system is different during different points of time, for example depending on type of milking operation being performed. Therefore, in order to keep a certain desired vacuum level, the vacuum pumps have to be run at different speeds at different times depending on the amount of air to be removed at the different times to provide this desired vacuum level.
  • running vacuum pumps in parallel refers to the case when two or more vacuum pumps receives the same control signal from the control unit 2 and their speed is regulated in accordance with this control signal.
  • a vacuum pump is added (ramped up) or removed (ramped down) the vacuum pump being ramped up or ramped down is not run in parallel with the one or more other vacuum pump(s).
  • a second vacuum pump is needed, only the first vacuum pump is run based on the control signal from the regulator part of the control unit 2 .
  • the second vacuum pump has ramped up, the first vacuum pump is ramped down and they are then both run based on the same control signal, i.e. run in parallel.
  • variable speed vacuum pumps there is no need to over-dimension the capacity of one variable speed pump in order to be able to provide a required vacuum level at maximum amount of air let into the milking system, nor is there a need to run two or more variable speed vacuum pumps at their lower capacity limit.
  • the number of variable speed vacuum pumps that is in fact needed at a particular milking operation is utilized. To use two or more vacuum pumps running on, for example, half their maximum capacity is more energy consuming than having one vacuum pump running on its maximum capacity. The invention thus provides an energy efficient solution.
US12/450,069 2007-04-03 2008-04-02 Method in a milking system for creating a required vacuum level and computer program products Active 2029-05-12 US8381679B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SE0700828A SE531046C2 (sv) 2007-04-03 2007-04-03 En metod i ett mjölkningssystem för att skapa en erfordrad vakumnivå och datorprogramprodukter
SE0700828-7 2007-04-03
SE0700828 2007-04-03
PCT/SE2008/000242 WO2008121051A1 (en) 2007-04-03 2008-04-02 A method in a milking system for creating a required vacuum level and computer program products

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US20100018465A1 US20100018465A1 (en) 2010-01-28
US8381679B2 true US8381679B2 (en) 2013-02-26

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US12/450,069 Active 2029-05-12 US8381679B2 (en) 2007-04-03 2008-04-02 Method in a milking system for creating a required vacuum level and computer program products

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US (1) US8381679B2 (de)
EP (1) EP2131648B2 (de)
JP (1) JP5449132B2 (de)
CN (1) CN101646335B (de)
AU (1) AU2008233366B2 (de)
CA (1) CA2681980C (de)
NZ (1) NZ579704A (de)
RU (1) RU2461186C2 (de)
SE (1) SE531046C2 (de)
WO (1) WO2008121051A1 (de)

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US20190017511A1 (en) * 2017-07-14 2019-01-17 Grundfos Holding A/S Multi-pump control system
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US8905181B2 (en) * 2012-09-27 2014-12-09 Honda Motor Co., Ltd. Motorcycle internal combustion engine
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US20190017511A1 (en) * 2017-07-14 2019-01-17 Grundfos Holding A/S Multi-pump control system
US20190017513A1 (en) * 2017-07-14 2019-01-17 Grundfos Holding A/S Multi-pump control system
US10794384B2 (en) * 2017-07-14 2020-10-06 Grundfos Holding A/S Multi-pump control system with power consumption optimization
US10801503B2 (en) * 2017-07-14 2020-10-13 Grundfos Holding A/S Multi-pump control system with power consumption optimization
US10801504B2 (en) * 2017-07-14 2020-10-13 Grundfos Holding A/S Multi-pump control system with power consumption optimization
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SE0700828L (sv) 2008-10-04
US20100018465A1 (en) 2010-01-28
JP2010523111A (ja) 2010-07-15
RU2009140398A (ru) 2011-05-10
CA2681980A1 (en) 2008-10-09
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CA2681980C (en) 2015-09-15
AU2008233366A1 (en) 2008-10-09
RU2461186C2 (ru) 2012-09-20
CN101646335B (zh) 2012-09-19
EP2131648A1 (de) 2009-12-16
WO2008121051A1 (en) 2008-10-09
SE531046C2 (sv) 2008-12-02
AU2008233366B2 (en) 2012-08-09
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EP2131648B1 (de) 2016-12-14
EP2131648A4 (de) 2014-07-16

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